Improvement in grates for stoves



L. w. HARWOODQ Stove Grate.

Patented Sept. 8, 1863.

N. PETE, Pbvio-Lillwgnphcr, Waning'a'n. D, c

IINTTE STaTas aTeNT Trice.

IMPRQVEMENT IN GRATES FOR. STOVE S.

Specification forming part of Letters Patent No. 39,H 3, dated September 8, 1863.

To (ZZZ whom it mayboncern):

Be it known that I, LUTHER W. HARWOOD, of the city of Troy, in the county of Rensselaer and State of New York, have invented certain new and useful Improvements in Grates for Stoves, Furnaces, &c., of which the following embraces a sufficient description, reference being had to the annexed drawings, in which-- Figure I is a top view, and Fig. II a bottom view, of a stove-grate embodying my said invention. Figs. III and IV are bottom views of parts of that grate, and Fig. Vis a perspective view showing'the upper side of the same grate inclined as when dumping burned coal from the grate. Fig. VI is a bottomview of the outer frame of the grate, shown in Figs. I and II. Fig. VII is a bottom view of the whole, and Fig. VIII, a bottom view of a part, of anoth: er stove-grate embracing my said invention. Fig. IXis a side view, and Fig. X is a longitudt nal section, of parts of the grate shown in Figs. I, II, V, and VII; and Fig. XI is a perspective view of the under side of the grate shown in Figs. I, II, and V. Fig. XIIis a view of a handle for use in operating the grates shown by Figs. I, II,- V, VII, and XI; andFigs. XIII and XIV are crosssections of the grate shown bottom side up in Fig. II. p,

The same letters refer to like parts in all the figures, and the arrows therein indicate the directions in which the parts are moved.

Some stove-grates have heretofore eon-' sisted of two longitudinal parts or sub-grates placed side by side, and so that each subgrate could be reciprocated endwise along the other one to agitate burning coal on the grate and sift ashes therefrom; but I am not aware that such subgrates could also be rocked or turned together as one grate on an axis common to both sub-grates from a horizontal into a vertical or inclined position to dump refuse coal and ashes from the grate.

N ow, a part of my invention consists in making a grate for stoves, furnaces, &c., with two sub-grates, B 0, arranged together side by side, and supported at their ends by compound journals DD, composed of two shanks, b b, Fig. X, fast on one subgrate, B. and two other shanks, c c, Fig. IV, fast on the other sub-grate, c, all fitted together in pairs within suitable sockets or bearings, cl at, so that each of the sub-grates B G can be slid to and fro on its own shanks, b b or 0 c, and along the other subgrate to agitate burning coal on the grate and sift out ashes therefrom, and so that the said subgrates B and U can also he rocked or turned together as one grate on the said combined shanks as an axis common to both sub-grates from a horizontal into a vertical or inclined position, and viceversa, to dump refuse coal and ashes from the grate and return the grate into the proper horizontal position forhaving a fire made thereon. As regards this part of m yin vent-ion, I generally prefer to have the shanks b b and c c in the form of half-cylinders, as in Fig. XIII, and arranged with their flat sides against each other and in a' plane perpendicular or nearly so to that of the grate, and with both of the shanks of each journal resting directly against, and held together by, their respective supporting sockets or bearings d d; but I do not limit myself to that particular way of shaping, arranging, and holding together the shanks which constitute the divided or compound journals that are common to the two sub-grates, and whenever desirable l adopt any other suitable construction thereof which will allow the- .sub-grates to be slid to and fro along eachother on their respective shanks, and also rocked or turned together like one grate on the said combined shanks as an axis common to bothiof the sub-grates; and I also generally prefer to rock or tilt the grate by applying power to one of its divided journals, D, Fig. I, where it extends outside of its supporting-socket (Z, by means of a suitable removable handle,'E, Fig. XII, and to reciprocate the subgrates B and 0 simultaneously 1n opposite directions or along each other when in the proper horizontal position by applying power to the ends of the sub-gratessubstantially in the manner hereinafter particularly specified; but I do not limit myself to those modes of operating the sub-grates, and shall rock and reciprocate them by applying power through any suitable devices to either the shanks, ends, or sides of the subgrates as shall be deemed preferable, and, so far as regards the above specified part of my invention, I adopt any suitable means to counteract the natural tendency which the sub-grates have when in a horizontal position and loaded with coal to lop or turn down on their shanks, and by their leverage press or bind their said shanks hard against each other, or against the inner side of their supporting-sockets. and thereby make frictional resistance to the reciprocating or rocking movement of the sub'grates; but I generally prefer to accomplish that object by means of a device attached to or forming a part of and moving with the sub-grates, and without obstructing the upper surface of the grate or materially encumbering the lower side thereof. To that end I make one or both of the subgrates B U, with an arm or arms, Gr, Figs. II, IV, VII,XI, and XIV, fast to one sulograte, B or O, and extended laterally along and fitted to or against the under side of the other sub-grate, G or B, so as to thereby make the sub-grates mutually support each other in their proper relative positions, whether the grate is in motion or stationary in any required posture, and so as to likewise prevent the sub-grates, when horizontal and loaded with coal, from lopping or turning down under the weight thereof, so as to thereby make the shanks b b c c of the sub grates bind together in or against their supporting-sockets d d. This arrangement of an arm or arms, G, with two sub-grates, B (J, mounted on shanks b I) c 0, which together form two divided journals, D D, common to the two sub-grates, as above described, constitutes another part of my invention.

*Another part of my invention consists of the arrangement, in combination with two subgrates B O, mounted so as to be capable of sliding endwise past each other and of turning together sidewise in a frame, A, substantially as hereinbefore described, of a pair of vibrating levers, H. H, two pairs of followers, ffff, and two connecting-rods, K K, so that when the said sub-grates B U are reeiprocated endwise in a horizontal position with coal on them the said followers ff f f will then recede before and follow after the ends of the subgrates,andtherebypreventthecoalfromfalling in Figs. II, III, and XI, with the latter united to the connecting-rods K K by pivots h in their ends, or to have the followersffff fast upon or form part of the connecting-rods K K, as showuin Figs. VII and VIII and united loosely by studs i v, or their equivalent, to the levers H H, so as to be thereby reciprocated endwise on the frame A when the said levers are vibrated.

In order to more readily keep the grate in the proper horizontal position while burning coal thereon, I generally prefer to have one side, 13, of the grate a little wider than the other side, (l, and supported by a stop, F,

Figs, II, VI, VII, and XI, so that the grate can be tilted sidewise in only one direction to dump refuse matters off from the grate; and when the grate is thus tilted, as shown in Fig. V, the sub-grates B O and the followersfffj' are then liable to become slid or moved out of their proper places in respect to each other, so that the subgrates may hit against and be stopped by the followers on attempting to turn the grate back into the horizontal position. To overcome that difficulty without encumbering the upper side of the grate, I arrange an inclined projection or guide, m, Figs. II, VII, X, and XI, fast on the under side of each end of that half-grate B which is elevated when the grate is tilted, and also arrange a similar guide, 11, Figs. II, III, V, VII, VIII, XI, and XIII, on the under side and at the inner ends of those followers, ff, which are opposite to that I part, 0, of the grate which is depressed when the grate is inclined, so that while the grate is being turned back from the vertical or inclined position to the horizontal one the inclined guides on and a on the sub-grate and followers will then guide and force the followers and sub grates back into their proper relative positions. When the half-grates B U are free to be tilted sidewise in either direction, I then arrange the in clined guides m and a in the same manner on the under sides of both of the sub-grates B G and on all four of the followers or drivers down into and clogging up the spaces which fffj are between the ends 6 of the frame a and the ends g of the sub-grates, and which are alternately enlarged and contracted by the reciprocating movements of the sub-grates; and so that the two sub grates B G will be simultan eously, and yet independently, reciprocated side by side in opposite directions when in the horizontal position by vibrating one of the levers, H, by means of a handle, E, Fig. XlI, applied to a corresponding part, J, Figs. II, III, VII, VIII, and XI on the lever, while the sub-grates B 0 are constantly free to be rocked or turned sidewise as one grate on a common axis. In the practice of this part of my invention I have the levers H H pivoted at or about the middle, to the fixed frame A, or its equivalent, and I generally prefer to either have the followers or drivers ffff fast upon or form part of the levers H H, as shown what I claim as new, and of my invention, and desire to secure by Letters Patent, is

1. Two subgrates, B O, mounted side by side on shanks which are fast on the sub-grates, and so shaped and arranged together in sockets or bearings that the said sub-grates can be reciprocated along each other on their rev spective shanks, and also rocked or tilted together likeone grate on the said combined shanks as an axis common to both sub-grates, substantially as herein set forth.

2. In com bination with two reciprocating and rocking sub-grates mounted together on divided journals common to both sub-grates,

substantially as herein described, a supporting arm or" arms, Gr, arranged on the under side of and carried by the said combined subgrates, substantially as herein set forth.

3. The combination of a pair of levers, II

H, two sets of followers or drivers, f f ff, and two connectingrods, K K, with two sliding and turning sub-grates, B O, mounted together on divided journals common to both of the said sub-grates, substantially as herein set forth.

4. In combination with two sliding and turning sub-grates, B O, mounted together on divided journals common to both sub-grates, and provided with drivers or followers f f f f,

substantially as herein described, the inclined guides on n, arranged on the under side of and carried by the said combined sub-grates and followers, substantially as herein set forth.

. LUTHER W. HARWOOD.

Witnesses:

EDWARD F. MURRAY, AUSTIN F. PARK. 

